Nokia 6560 サービスマニュアル

RH-25

Troubleshooting - Baseband

CCS Technical Documentation

Page 6

 ©

 2003 Nokia Corporation        Confidential

Issue 1 10/2003

RH-25 supports data connectivity via an infrared link. An IR module is integrated into 
the phone, connected to the IR interface of the UPP ASIC.

The energy management of RH-25 is based on BB 4.0 architecture. A semi-fixed battery 
(BLD-3) supplies power primarily to UEM ASIC and the RF PA. UEM includes several reg-
ulators to supply RF and baseband. It provides the energy management including power 
up/down procedure.

The functional behavior of the UEM can be divided into seven different states. Since the 
UEM controls the regulated power distribution of the phone, each of these states affects 
the general functionality of the phone:

• No  supply
• Backup
• Power  off
• Reset
• Power  on
• Sleep
• Protection

The different states of the UEM are detailed in the sections below.

No Supply

In the NO_SUPPLY mode, the UEM has no supply voltage (VBAT < V

MSTR

 and VBACK < 

V_BU

COFF-

). This mode is due to the fact that both the main battery and the backup bat-

tery are either disconnected or both discharged to a low voltage level.

The UEM will recover from NO_SUPPLY into RESET mode if the VBAT voltage level rises 
above the V

MSTR+

 level by either reconnecting the main battery or charge it to such level.

Backup

In BACK_UP mode the main battery is either disconnected or has a low voltage level 
(VBAT < V

MSTR-

 and VBACK > V_BU

COFF+

).

The regulator VRTC that supplies the real-time clock is disabled in BACK_UP mode. 
Instead the unregulated backup battery voltage VBACK supplies the output of the VRTC. 
All other regulators are disabled and the phone has no functionality.

The UEM will recover from BACK_UP mode into RESET mode if VBAT rises above V

MSTR+

.

Power Off

In order for the UEM to be in PWR_OFF mode, it must have supply voltage (VBAT > 
V

MSTR+

).